Electrostatic capacitance type touch panel and method of detecting input operation position therein

Abstract

An electrostatic capacitance type touch panel is provided which detects an input operation position with high accuracy without being affected by noise irrespective of the input operation position and the size of an input operation body. A method of detecting an input operation position in the capacitance type touch panel is also provided. When an input operation position is in between adjoining intersection points (m,n), voltage change levels R(m, n), which are less than a cutoff threshold value, of intersection points (m1, n1) on a side opposite to the input operation position are removed from calculation data for the input operation position. Thus, even if either of the adjoining intersection points (m,n) is designated as an intersection point (m0, n0) having a maximum value, the calculated input operation position does not largely change.

Description

technical field [0001] The present invention relates to an electrostatic capacitive touch panel and an input operation position detection method thereof. The input operation position is detected according to the arrangement position of the intersection point of the driving region where the electrostatic capacitance changes due to the approach of the input operation body and the detection electrode on the insulating panel, In particular, it relates to a capacitive touch panel capable of detecting an input operation position with high precision without being affected by noise. Background technique [0002] In the electrostatic capacitive touch panel that detects the input position of an input operation body such as a finger, it is divided into a self-capacitance method (1-wire type) and a mutual capacitance method (2-wire type). The detection electrode with increased stray capacitance detects the input operation position according to the arrangement position of the detection e...

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Problems solved by technology

[0015] The same problem also occurs when an input operation is performed by an input operation body exceeding the distance between the drive region DV(m) and the detection electrode S(n), the voltage change level at the adjacent intersection points (m, n) R(m, n) approximates the vicinity of the maximum value, and the intersection point (m0, n0) that becomes the maximum value changes between adjacent intersection points (m, n) for each scan cycle, and the calculated input The operating position changes frequently

[0016] In addition, this capacitive touch panel detects the input operation position based on the voltage change level R(m, n) of the detection voltage corresponding to the change of the weak electrostatic capacitance of the input operation body, so it is easily affected by the display device arranged around it. The noise generated and the influence of static noise charged in the surrounding stray capacitance, but the detection period for one intersection point (m, n) is 200 to 400μsec, so these static noises generated during the period from 5μsec to 10μsec are only It is expressed in the voltage change level R(m, n) of the intersection point (m, n), which cannot be judged by the existing noise judgment method

[0017] Furthermore, in an input operation whose maximum value is near the input determination threshold, the voltage change levels R(m, n) of the multiple intersections (m1, n1) around it are smaller than the input determination threshold, and are not used for calculating the input operation position. Therefore, the input operation position is calculated according to the voltage change level R(m, n) of the limited effective intersection point, and there is a problem that its accuracy decreases

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